| /* |
| * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 5037596 |
| * @summary Verify bitwise conversion works for non-canonical NaN values |
| * @library ../Math |
| * @build FloatConsts |
| * @run main BitwiseConversion |
| * @author Joseph D. Darcy |
| */ |
| |
| import static java.lang.Float.*; |
| |
| public class BitwiseConversion { |
| static int testNanCase(int x) { |
| int errors = 0; |
| // Strip out sign and exponent bits |
| int y = x & FloatConsts.SIGNIF_BIT_MASK; |
| |
| float values[] = { |
| intBitsToFloat(FloatConsts.EXP_BIT_MASK | y), |
| intBitsToFloat(FloatConsts.SIGN_BIT_MASK | FloatConsts.EXP_BIT_MASK | y) |
| }; |
| |
| for(float value: values) { |
| if (!isNaN(value)) { |
| throw new RuntimeException("Invalid input " + y + |
| "yielded non-NaN" + value); |
| } |
| int converted = floatToIntBits(value); |
| if (converted != 0x7fc00000) { |
| errors++; |
| System.err.format("Non-canoncial NaN bits returned: %x%n", |
| converted); |
| } |
| } |
| return errors; |
| } |
| |
| public static void main(String... argv) { |
| int errors = 0; |
| |
| for (int i = 0; i < FloatConsts.SIGNIFICAND_WIDTH-1; i++) { |
| errors += testNanCase(1<<i); |
| } |
| |
| if (floatToIntBits(Float.POSITIVE_INFINITY) |
| != 0x7F800000) { |
| errors++; |
| System.err.println("Bad conversion for +infinity."); |
| } |
| |
| if (floatToIntBits(Float.NEGATIVE_INFINITY) |
| != 0xFF800000) { |
| errors++; |
| System.err.println("Bad conversion for -infinity."); |
| } |
| |
| if (errors > 0) |
| throw new RuntimeException(); |
| } |
| } |